Right click in the left nav not propogating to CGI pages

We have an application developed in CGI using C. The application does have a left navigation tree. The left navigation tree is developed using javascript and ajax. The current nav frame is HTML.

Nodes in the left navigation does not have right click menus but we want to add that functionality.

The problems encountered were that when user "right clicked" the mouse, the OS browser caught the action and it was not passed to the CMC GUI for action. Problem is bypassing the OS Browser to send the mouse press action to the application.